other side of the bay is a cal game on saturday. look a little further south, sunday, football game, candlestick house, full house for the 49ers. we have a madonna concert in san jose on sunday. there's a half a marathon they are going to be running in san jose, as well. >> if you can, try to arrange for public transportation, try to find a carpool, drive with people, if you are planning to come to events here in the city. >> reporter: law enforcement will be out in force. if you can't take bart, muni, caltrain or anything else, you don't drive, here's a simple tip. fill your gas tank! sounds like a big doh, but you would be surprised. >> traffic slows down, people start to idle. they are on the road for a little longer than they anticipated. just make sure you have a full tank of gas before you get started. >> reporter: you run out of gas on the road, you're stuck. tow trucks are going to get stuck in traffic, too. you think this can't happen? i'm going to admissibility i got a new car about five years ago. i ran out of gas on the